Grantham, Mayo, Van Otterloo & Co (GMO)
ALT icon

Grantham, Mayo, Van Otterloo & Co (GMO)’s Altimmune ALT Stock Holding History

Grantham, Mayo, Van Otterloo & Co (GMO)’s Portfolio ALT Stock Details ALT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$255K Sell
83,837
-42,552
-34% -$127K ﹤0.01% 619
2026
Q1 		$389K Sell
126,389
-46,170
-27% -$196K ﹤0.01% 568
2025
Q4 		$623K Buy
+172,559
New +$752K ﹤0.01% 562

Other funds holding ALT

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BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
TCM
TCG Crossover Management Palo Alto, California $4.16B AUM 983.43% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Grantham, Mayo, Van Otterloo & Co (GMO)'s ALT Position: Q2 2026 in Review

Grantham, Mayo, Van Otterloo & Co (GMO) reduced its Altimmune (ALT) stake by 34% in Q2 2026, selling an estimated $127K and leaving 83,837 shares worth $255K. The position accounts for ﹤0.01% of the portfolio, ranked #619.

Grantham, Mayo, Van Otterloo & Co (GMO) first reported a position in ALT in Q4 2025 and has held it in 3 quarters since. The position peaked at $623K in Q4 2025. 211 funds tracked by Wall St. Rank hold ALT as of Q2 2026.

  • Grantham, Mayo, Van Otterloo & Co (GMO) held 83,837 shares of Altimmune worth $255K as of Q2 2026.
  • Grantham, Mayo, Van Otterloo & Co (GMO) sold 42,552 Altimmune shares in Q2 2026, an estimated $127K.
  • Altimmune made up ﹤0.01% of Grantham, Mayo, Van Otterloo & Co (GMO)'s portfolio in Q2 2026, its #619 holding.
  • Grantham, Mayo, Van Otterloo & Co (GMO) first reported a position in Altimmune in Q4 2025 and has held it in 3 quarters since.
  • Grantham, Mayo, Van Otterloo & Co (GMO)'s Altimmune position peaked at $623K in Q4 2025.
  • 211 funds tracked by Wall St. Rank held Altimmune as of Q2 2026.

Based on Grantham, Mayo, Van Otterloo & Co (GMO)'s 13F filing for Q2 2026, filed 13 Aug 2026.